Report of a geological exploration of part of Iowa, Wisconsin, and Illinois, made under instructions from the Secretary of the Treasury of the United States, in the autumn of the year 1839; with charts and illustrations. By David Dale Owen, M. D., Principal Agent to Explore the Mineral Lands of the United States
Report of a geological exploration of part of Iowa, Wisconsin, and Illinois, made under instructions from the Secretary of the Treasury of the United States, in the autumn of the year 1839; with charts and illustrations. By David Dale Owen, M. D., Principal Agent to Explore the Mineral Lands of the United States
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